用java操作MySQL编写的高校水电费管理系统

本系统需要使用MySQL的java驱动包，这个包可以在网站下载，具体安装方法不同的编译器不同，这个需要另行进行搜索，下面是具体的代码实现：

1.连接MySQL

package cn.com.Universty;import java.sql.*;public class MySQLConnection {public static final String DRIVER = "com.mysql.cj.jdbc.Driver";//设置driverpublic static final String URL = "jdbc:mysql://localhost:3306/university";//设置连接端口和数据库名public static final String USER = "root";//设置数据库的用户名public static final String PASSWORD = "123456789";//设置数据库的密码public static Connection getConnection(){//设置连接函数Connection connection = null;try {Class.forName(DRIVER);} catch (ClassNotFoundException e) {e.printStackTrace();}try {connection = DriverManager.getConnection(URL,USER,PASSWORD);//建立连接} catch (SQLException e) {e.printStackTrace();}return connection;}public static void close(Connection conn) throws SQLException {if (conn != null){conn.close();}}public static void close(PreparedStatement pstmt) throws SQLException {if (pstmt != null){pstmt.close();}}public static void close(Statement stmt) throws SQLException {if (stmt != null){stmt.close();}}public static void  close(ResultSet rs) throws SQLException {if (rs != null){rs.close();}}}

2.设置Student

package cn.com.Universty;import java.io.Serializable;
import java.util.Objects;public  class  Student implements Serializable {//toString这个方法很重要private long   snum;@Overridepublic boolean equals(Object o) {if (this == o) return true;if (o == null || getClass() != o.getClass()) return false;Student student = (Student) o;return snum == student.snum &&sage == student.sage &&Double.compare(student.select, select) == 0 &&Double.compare(student.swater, swater) == 0 &&sname.equals(student.sname) &&ssex.equals(student.ssex) &&sclass.equals(student.sclass) &&secost.equals(student.secost) &&swcost.equals(student.swcost);}@Overridepublic int hashCode() {return Objects.hash(snum, sname, ssex, sage, sclass, select, swater, secost, swcost);}private String sname;private String ssex;@Overridepublic String toString() {return "Student{" +"snum=" + snum +", sname='" + sname + '\'' +", ssex='" + ssex + '\'' +", sage=" + sage +", sclass='" + sclass + '\'' +", select=" + select +", swater=" + swater +", secost='" + secost + '\'' +", swcost='" + swcost + '\'' +'}';}private int sage;private String sclass;private double select;private double swater;private String secost;private String swcost;public long getSnum() {return snum;}public void setSnum(long snum) {this.snum = snum;}public String getSname() {return sname;}public void setSname(String sname) {this.sname = sname;}public String getSsex() {return ssex;}public void setSsex(String ssex) {this.ssex = ssex;}public int getSage() {return sage;}public void setSage(int sage) {this.sage = sage;}public String getSclass() {return sclass;}public void setSclass(String sclass) {this.sclass = sclass;}public double getSelect() {return select;}public void setSelect(double select) {this.select = select;}public double getSwater() {return swater;}public void setSwater(double swater) {this.swater = swater;}public String getSecost() {return secost;}public void setSecost(String secost) {this.secost = secost;}public String getSwcost() {return swcost;}public void setSwcost(String swcost) {this.swcost = swcost;}}

3.用Java对MySQL进行数据的增删改查

package cn.com.Universty;import java.sql.*;
import java.util.ArrayList;public class MySQLUse {public static String MadeString(Student student){//原始的建立MySQL的语句的方式String sql = "insert into Student values("+student.getSnum()+",\'"+student.getSname()+"\',\'"+student.getSsex()+"\',"+student.getSage()+",\'"+student.getSclass()+"\',"+student.getSelect()+","+student.getSwater()+",\'"+student.getSecost()+"\',\'"+student.getSwcost()+"\')";return sql;}public static int Add(Student student){//向数据库中添加数据的方法int a=0;Connection connection;connection = MySQLConnection.getConnection();//连接数据库try {if (connection.isClosed())System.out.println("增加数据时数据库连接失败！！！");Statement statement = connection.createStatement();String sql = MadeString(student);//System.out.println(sql);if (statement.executeUpdate(sql)!=0)//判断数据库的语言是否已经执行{System.out.println("插入成功！");a=1;}else{ System.out.println("插入失败！");a=0;}MySQLConnection.close(statement);MySQLConnection.close(connection);} catch (SQLException e) {e.printStackTrace();}return a;}public static int Delete(long student){//以学号为媒介删除；int a=0;Connection connection;connection = MySQLConnection.getConnection();try {if (connection.isClosed()){System.out.println("删除数据时数据库连接失败！！！");}Statement statement = connection.createStatement();String sql = "delete from Student where snum="+student;if (statement.executeUpdate(sql)!=0){System.out.println("删除成功！");a=1;}else{System.out.println("删除失败！");a=0;}MySQLConnection.close(statement);MySQLConnection.close(connection);} catch (SQLException e) {e.printStackTrace();}return a;}public static int Delete(String string){//以名字为媒介删除；int a=0;Connection connection;connection = MySQLConnection.getConnection();try {if (connection.isClosed()){System.out.println("删除数据时数据库连接失败！！！");}Statement statement = connection.createStatement();String sql = "delete from Student where sname='%s'";//PreparedStatement ps = connection.prepareStatement(sql);//ps.setString(1,string);//System.out.println(ps.getResultSet());//String str = ps.toString();//System.out.println(ps.toString());//ResultSet rs = ps.executeQuery();if (statement.executeUpdate(String.format(sql,string))!=0){System.out.println("删除成功！");a=1;}else{System.out.println("删除失败！");a=0;}MySQLConnection.close(statement);MySQLConnection.close(connection);} catch (SQLException e) {e.printStackTrace();}return a;}public static Student Select(long id){//以学号为媒介进行查看数据Student student = new Student();Connection connection;connection = MySQLConnection.getConnection();try {if (connection.isClosed()){System.out.println("查询数据库内容时连接数据库失败！！！");}Statement statement = connection.createStatement();String sql = "select * from Student where snum=?";//采用PreparedStatement进行占位PreparedStatement ps = connection.prepareStatement(sql);ps.setLong(1,id);ResultSet rs = ps.executeQuery();while (rs.next()){Student stu = new Student();stu.setSnum(rs.getLong("snum"));//System.out.print(stu.getSnum()+"\t");stu.setSname(rs.getString("sname"));//System.out.print(stu.getSname()+"\t");stu.setSsex(rs.getString("ssex"));//System.out.print(stu.getSsex()+"\t");stu.setSage(rs.getInt("sage"));//System.out.print(stu.getSage()+"\t");stu.setSclass(rs.getString("sclass"));//System.out.print(stu.getSclass()+"\t");stu.setSelect(rs.getDouble("selec"));//System.out.print(stu.getSelect()+"\t");stu.setSwater(rs.getDouble("swater"));//System.out.print(stu.getSwater()+"\t");stu.setSecost(rs.getString("secost"));//System.out.print(stu.getSecost()+"\t");stu.setSwcost(rs.getString("swcost"));//System.out.print(stu.getSwcost());student=stu;}MySQLConnection.close(rs);MySQLConnection.close(ps);MySQLConnection.close(statement);MySQLConnection.close(connection);} catch (SQLException e) {e.printStackTrace();}return student;}public static  ArrayList<Student>  Select(){//以列表的方式进行提取所有数据库中的信息ArrayList<Student> students = new ArrayList<>();Connection connection;connection = MySQLConnection.getConnection();try {if (connection.isClosed()){System.out.println("查寻数据库时连接数据库失败！！！");}Statement statement = connection.createStatement();String sql = "select * from Student ";ResultSet rs = statement.executeQuery(sql);while (rs.next()){Student student = new Student();student.setSnum(rs.getLong("snum"));student.setSname(rs.getString("sname"));student.setSsex(rs.getString("ssex"));student.setSclass(rs.getString("sclass"));student.setSage(rs.getInt("sage"));student.setSelect(rs.getDouble("selec"));student.setSwater(rs.getDouble("swater"));student.setSecost(rs.getString("secost"));student.setSwcost(rs.getString("swcost"));students.add(student);}MySQLConnection.close(rs);MySQLConnection.close(statement);MySQLConnection.close(connection);} catch (SQLException e) {e.printStackTrace();}//System.out.println(students);return students;}public static int Update(long id,Student student) {//更新数据库中的数据，采用的是以学号为媒介先删除原有的再添加修改后的int a = 0,b = 0,c = 0;b = Delete(id);if (b == 1 ){a = 1;c = Add(student);if ( c ==0) {a = 0;System.out.println("修改学生信息时增加更新信息失败! !");}}else System.out.println("删除信息失败");return a;}}

4.设计系统的主体部分

package cn.com.Universty;import java.util.ArrayList;
import java.util.Scanner;public class StudentControl {public static void StudentSet(ArrayList<Student> list){//向数据库中添加数据Student student = new Student();Scanner scanner = new Scanner(System.in);int i=0;// Boolean bool = false;System.out.println("=====================欢迎来到学生信息添加系统====================");System.out.print("请输入学生的学号：");student.setSnum(scanner.nextLong());for (i=0;i<list.size();i++){if (list.get(i).getSnum()==student.getSnum()){//判断键入的学号原有数据库中是否已存在//bool=true;System.out.print("学号已存在，请重新输入：");student.setSnum(scanner.nextLong());//i=0;// continue;}}//if ()System.out.print("请输入学生的姓名：");student.setSname(scanner.next());do {System.out.print("请输入学生的性别：");student.setSsex(scanner.next());}while (!student.getSsex().equals("男")&&!student.getSsex().equals("女"));System.out.print("请输入学生的年龄: ");student.setSage(scanner.nextInt());System.out.print("请输入学生的班级: ");student.setSclass(scanner.next());System.out.print("请输入学生的用电量(度)：");student.setSelect(scanner.nextDouble());do {System.out.print("该学生是否已经缴纳电费(填“是”或“否”):");student.setSecost(scanner.next());}while (!student.getSecost().equals("是")&&!student.getSecost().equals("否"));System.out.print("请输入学生的用水量(吨)：");student.setSwater(scanner.nextDouble());do {System.out.print("请输入学生是否缴纳水费：");student.setSwcost(scanner.next());}while (!student.getSwcost().equals("是")&&!student.getSwcost().equals("否"));MySQLUse.Add(student);}public static void StudentGetAll(ArrayList<Student> list){//输出所有的数据库中的信息int i=0;System.out.println("学生信息如下：");System.out.print("学号\t");System.out.print("姓名\t");System.out.print("性别\t");System.out.print("年龄\t");System.out.print("班级\t");System.out.print("用电量(度)\t");System.out.print("电费缴纳情况\t");System.out.print("用水量(吨)\t");System.out.print("水费缴纳情况\t");System.out.println();for (i=0;i<list.size();i++){System.out.print(list.get(i).getSnum());System.out.print("\t");System.out.print(list.get(i).getSname());System.out.print("\t");System.out.print(list.get(i).getSsex());System.out.print("\t");System.out.print(list.get(i).getSage());System.out.print("\t");System.out.print(list.get(i).getSclass());System.out.print("\t");System.out.print(list.get(i).getSelect());System.out.print("\t");System.out.print(list.get(i).getSecost());System.out.print("\t");System.out.print(list.get(i).getSwater());System.out.print("\t");System.out.print(list.get(i).getSwcost());System.out.print("\t");System.out.println();}}public static void StudentGetOne(Long num){//以学号为媒介进行查找学生信息Student student = new Student();student = MySQLUse.Select(num);if (student==null) {System.out.println("查无此人!!");}else   {System.out.println("学生信息如下：");System.out.print("学号\t");System.out.print("姓名\t");System.out.print("性别\t");System.out.print("年龄\t");System.out.print("班级\t");System.out.print("用电量(度)\t");System.out.print("电费缴纳情况\t");System.out.print("用水量(吨)\t");System.out.print("水费缴纳情况\t");System.out.println();System.out.print(student.getSnum());System.out.print("\t");System.out.print(student.getSname());System.out.print("\t");System.out.print(student.getSsex());System.out.print("\t");System.out.print(student.getSage());System.out.print("\t");System.out.print(student.getSclass());System.out.print("\t");System.out.print(student.getSelect());System.out.print("\t");System.out.print(student.getSecost());System.out.print("\t");System.out.print(student.getSwater());System.out.print("\t");System.out.print(student.getSwcost());System.out.print("\t");System.out.println();}}public static void StudentGetOne(String sname){//以姓名为媒介进行查找数据库中的信息ArrayList<Student> list = new ArrayList<>();list = MySQLUse.Select();int i = 0;System.out.print("学号\t");System.out.print("姓名\t");System.out.print("性别\t");System.out.print("年龄\t");System.out.print("班级\t");System.out.print("用电量(度)\t");System.out.print("电费缴纳情况\t");System.out.print("用水量(吨)\t");System.out.print("水费缴纳情况\t");System.out.println();for (i=0;i<list.size();i++){if (list.get(i).getSname().equals(sname)){System.out.print(list.get(i).getSnum());System.out.print("\t");System.out.print(list.get(i).getSname());System.out.print("\t");System.out.print(list.get(i).getSsex());System.out.print("\t");System.out.print(list.get(i).getSage());System.out.print("\t");System.out.print(list.get(i).getSclass());System.out.print("\t");System.out.print(list.get(i).getSelect());System.out.print("\t");System.out.print(list.get(i).getSecost());System.out.print("\t");System.out.print(list.get(i).getSwater());System.out.print("\t");System.out.print(list.get(i).getSwcost());System.out.print("\t");System.out.println();}}}public static void StudentSesrch(){//查询系统Scanner scanner = new Scanner(System.in);int choice;while (true) {System.out.println("*************欢迎来到查询系统****************");System.out.println("**************1.学号查询********************");System.out.println("**************2.姓名查询********************");System.out.println("**************3.用电量查询******************");System.out.println("**************4.用水量查询******************");System.out.println("**************0.退出查询系统****************");System.out.print("请输入要执行的操作指令代码(1、2、3、4、0): ");choice = scanner.nextInt();while (true) {if (choice != 1 && choice != 2 && choice != 3 && choice != 4 && choice != 0) {System.out.print("输入指令错误，请重新输入：");choice = scanner.nextInt();//continue;} elsebreak;}if (choice == 0){break;}else if (choice == 1){long snum;System.out.print("请输入要查询的学生的学号：");snum = scanner.nextLong();StudentGetOne(snum);}else if (choice == 2){String sname;System.out.print("请输入要查询的学生的姓名:");sname = scanner.next();StudentGetOne(sname);}else if (choice == 3){System.out.print("请输入学生的学号：");long snum;snum = scanner.nextLong();Student student = new Student();student = MySQLUse.Select(snum);System.out.println(student.getSname()+"的用电量为："+student.getSelect());if (student.getSecost().equals("否")){System.out.println("还未交电费，请及时缴纳！");}elseSystem.out.println("已缴纳电费。");}else if (choice == 4){System.out.print("请输入要查询学生的学号：");long sum;sum = scanner.nextLong();Student student = new Student();student = MySQLUse.Select(sum);System.out.println(student.getSname()+"的用水量为："+student.getSwater());if (student.getSwcost().equals("否")){System.out.println("还未交水费，请及时缴纳！");}elseSystem.out.println("水费已缴纳。");}}}public static void StudentChange(){//修改信息Scanner scanner = new Scanner(System.in);System.out.print("请输入要修改的学生的学号: ");long snum;snum = scanner.nextLong();Student student = new Student();System.out.print("输入修改后的学号：");student.setSnum(scanner.nextLong());System.out.print("输入修改后的姓名：");student.setSname(scanner.next());System.out.print("输入修改后的性别：");student.setSsex(scanner.next());System.out.print("输入修改后的年龄：");student.setSage(scanner.nextInt());System.out.print("输入修改后的班级：");student.setSclass(scanner.next());System.out.print("输入修改后的用电量(度)：");student.setSelect(scanner.nextDouble());System.out.print("输入修改后的电费缴纳情况: ");do {student.setSecost(scanner.next());}while (!student.getSecost().equals("是")&&!student.getSecost().equals("否"));System.out.print("输入修改后的用水量(吨): ");student.setSwater(scanner.nextDouble());System.out.print("输入修改后的水费缴纳情况：");do {student.setSwcost(scanner.next());}while (!student.getSwcost().equals("是")&&!student.getSwcost().equals("否"));int a = 0;a = MySQLUse.Update(snum,student);if (a==1){System.out.println("修改成功！");}elseSystem.out.println("修改失败！");}public static void StudentDelete(){//删除学生信息Scanner scanner = new Scanner(System.in);System.out.print("请输入要删除人的学号：");long snum;snum = scanner.nextLong();int a =0;a = MySQLUse.Delete(snum);if (a==1){System.out.println("删除成功！");}elseSystem.out.println("删除失败！");}public static void StudentCount() {//信息统计Scanner scanner = new Scanner(System.in);int choice;double useelec=0,arrangeuseelec=0,usewater=0,arrangeusewater=0;//依次是电量使用、平均电量、用水量、平均水量ArrayList<Student> list = new ArrayList<>();list = MySQLUse.Select();while (true) {System.out.println("********************欢迎来到统计系统******************");System.out.println("********************1.统计用电量*********************");System.out.println("********************2.统计用水量*********************");System.out.println("********************3.统计电费***********************");System.out.println("********************4.统计水费***********************");System.out.println("********************0.退出统计系统*******************");System.out.print("请输入你要执行的操作：");choice = scanner.nextInt();while (true) {if (choice != 1 && choice != 2 && choice != 3 && choice != 4 && choice != 0) {System.out.print("输入指令错误，请重新输入：");choice = scanner.nextInt();//continue;} else break;}if (choice == 0) {break;}else if (choice == 1){int i = 0,upeople=0,downpeople=0,equalpeople=0;for (i=0;i<list.size();i++){useelec+=list.get(i).getSelect();//i++;}arrangeuseelec=useelec/i;//i=0;for (i=0;i<list.size();i++){if (list.get(i).getSelect()>arrangeuseelec){upeople++;}else if (list.get(i).getSelect()==arrangeuseelec){equalpeople++;}else if (list.get(i).getSelect()<arrangeuseelec){downpeople++;}//i++;}System.out.println("用电量情况统计如下：");System.out.println("------------------------------");System.out.println("|       总用电量         |"+useelec+"度");System.out.println("|       平均用电量       |"+arrangeuseelec+"度");System.out.println("|  超过平均用电量的人数   |"+upeople+"人");System.out.println("|  等于平均用电量的人数   |"+equalpeople+"人");System.out.println("|  低于平均用电量的人数   |"+downpeople+"人");System.out.println("------------------------------");}else if (choice == 2){int i = 0,upeople=0,downpeople=0,equalpeople=0;for (i=0;i<list.size();i++){usewater+=list.get(i).getSwater();//i++;}arrangeusewater=usewater/i;// i=0;for (i=0;i<list.size();i++){if (list.get(i).getSwater()>arrangeusewater){upeople++;}else if (list.get(i).getSwater()==arrangeusewater){equalpeople++;}else if (list.get(i).getSwater()<arrangeusewater){downpeople++;}//i++;}System.out.println("用水量情况统计如下：");System.out.println("------------------------------");System.out.println("|       总用水量         |"+useelec+"吨");System.out.println("|       平均用水量       |"+arrangeuseelec+"吨");System.out.println("|  超过平均用水量的人数   |"+upeople+"人");System.out.println("|  等于平均用水量的人数   |"+equalpeople+"人");System.out.println("|  低于平均用水量的人数   |"+downpeople+"人");System.out.println("------------------------------");}else if (choice == 3){double price;double free;double cost=0;int sum1=0,sum2=0,i=0;//sum1为已缴纳人数,sum2为未缴纳人数System.out.println("请输入电费价格(度/元): ");price = scanner.nextDouble();System.out.println("请输入免费额度(度): ");free = scanner.nextDouble();for (i=0;i<list.size();i++){if (list.get(i).getSelect()<=free){cost+=0;sum1++;}else if (list.get(i).getSelect()>free){cost += (list.get(i).getSelect()-free)*price;if (list.get(i).getSecost().equals("是")){sum1++;}else sum2++;}//i++;}System.out.println("已缴纳人数为: "+sum1);System.out.println("未缴纳人数为："+sum2);}else if (choice==4){double price;double free;double cost=0;int sum1=0,sum2=0,i=0;//sum1为已缴纳人数,sum2为未缴纳人数System.out.println("请输入水费价格(吨/元): ");price = scanner.nextDouble();System.out.println("请输入免费额度(吨): ");free = scanner.nextDouble();for (i=0;i<list.size();i++){if (list.get(i).getSwater()<=free){cost+=0;sum1++;}else if (list.get(i).getSwater()>free){cost += (list.get(i).getSwater()-free)*price;if (list.get(i).getSwcost().equals("是")){sum1++;}else sum2++;}// i++;}System.out.println("已缴纳人数为: "+sum1);System.out.println("未缴纳人数为："+sum2);}}}public static void MadeStudent(){//学生信息操作总界面Scanner scanner = new Scanner(System.in);int choice ;ArrayList<Student> list = new ArrayList<>();list=null;while (true) {System.out.println("******************学生水电费管理系统************************");System.out.println("******************1.学生信息录入***************************");System.out.println("******************2.全部学生信息查询************************");System.out.println("******************3.单个学生信息查询************************");System.out.println("******************4.学生信息删除系统************************");System.out.println("******************5.学生信息修改系统************************");System.out.println("******************6.学生信息统计系统*************************");System.out.println("******************0.退出管理系统*****************************");System.out.print("请输入操作代码：");choice = scanner.nextInt();while (true) {if (choice != 1 && choice != 2 && choice != 3 && choice != 4 &&choice != 5 && choice != 6 && choice != 0) {System.out.print("输入指令错误，请重新输入：");choice = scanner.nextInt();//continue;} elsebreak;}if (choice == 0){break;}else if (choice ==1 ){list=MySQLUse.Select();StudentSet(list);}else if (choice == 2){list = MySQLUse.Select();StudentGetAll(list);}else if (choice == 3){StudentSesrch();}else if (choice == 4){StudentDelete();}else if (choice == 5){StudentChange();}else if (choice == 6){StudentCount();}}}}

5.执行部分

package cn.com.Universty;public class StudentUse {public static void main(String[] args) {//执行语句StudentControl.MadeStudent();}
}

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用java操作MySQL编写的高校水电费管理系统

1.连接MySQL

2.设置Student

3.用Java对MySQL进行数据的增删改查

4.设计系统的主体部分

5.执行部分

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